Instagram Stories is a lurker's paradise compared to Snapchat because it doesn't snitch on you if you screenshot.

Instagram DOES alert people if you screenshot a DM to them, but if you're screenshotting DMs, you're a jerk. Lurker's Code (I just made that up, it's not a thing, but I think now it's a Thing?) is that you can freely screenshot public Stories to gossip about with your friends for later.

But now, in a test, Instagram is telling people if someone screenshotted their story.